Search results

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

  1. leerkracht

    18 Cylinders Isotta Fraschini (straight six-cylinder x3 )

    1 -gasNitriding is done by a professionel firm 2 - bronze ( RG7 )bearing shells have a light press fitting and a silver steel pin of diameter 4mm prevents rotating (the hole is for the oil ) 3- center hole 6mm in the cranckschaft for the oil > closed on the webs , feeding from an oil...
  2. leerkracht

    18 Cylinders Isotta Fraschini (straight six-cylinder x3 )

    crankshaft V 10 -72° project DOHC the crankshafts for my multi-cylinder engines (two 12 cilindersOHC )are of 42CrMo4 steel ( 4140 ) the material has been at home for over 10 years and most internal stresses have disappeared The photos are the guideline for the construction, pre-turn , than...
  3. leerkracht

    18 Cylinders Isotta Fraschini (straight six-cylinder x3 )

    there is a saying (there is a difference in theory and practice , but in practice the difference is even greater than in theory) gr
  4. leerkracht

    18 Cylinders Isotta Fraschini (straight six-cylinder x3 )

    Hallo Foketry the plug is in the hemi shape head keep your piston so simpel as possible , the modelengines from the beginning has a baffle (on two stroke engines ) this work wel , your pistons with a dome and a plug on the side wil work , for testing make a simple 1 cilinder gr
  5. leerkracht

    18 Cylinders Isotta Fraschini (straight six-cylinder x3 )

    Hallo Foketry The engine must work with your piston design as on -30- flame travel is short , first runs on glow fuel wiht glow plugs the v 10 engine is the project i am working on (bore and stroke 26mm )my own design and make gr
  6. leerkracht

    A new attempt at making piston rings

    Hello for dimentions see reply 227 0.02 mm is the amount that are removed from the cilinder wall ,for a good surface round and cilindrical boring >> not the interference fit by the way an ABC cilinder piston(wihtout ring) unit has a negative fit in the top of the cilinder , the fit is...
  7. leerkracht

    A new attempt at making piston rings

    Hello ring fixture for annealing and attach the ring to the piston lapping fixture cast iron GGG40 diameter 0.2mm less than cilinder , lapping paste grid 600 thinned with petrol > paste 600 between lap and cilinder wall you only remove 0.02 mm less than 0.001 inch start...
  8. leerkracht

    A new attempt at making piston rings

    Finally all you need to know about piston rings https://www.ms-motorservice.com.tr/fileadmin/media/MAM/PDF_Assets/Piston-Rings-for-Combustion-Engines_53094.pdf all you need to know about cast iron > stres relieving and temp range...
  9. leerkracht

    A new attempt at making piston rings

    groove width smaller than cutting tool look at the PDF drawing for info
  10. leerkracht

    Porsche 917 flat 12 engine

    Just like this gr
  11. leerkracht

    V 12 engine's

    hello i used the paper element of a fuel filter
  12. leerkracht

    straight 6

    the v12 of 180 ° runs uneven on idle because it was the first run of this engine , so completely new and not yet properly settings of the carburator and run in , now this engine runs very smoothly over the entire rev range.800-3600 rpm under load of the 4 bladed prop wiht a 3 blade or 2...
  13. leerkracht

    V 12 engine's

    double straight six (V12 60°) with six double carburetors conversion of 3 single( Super Tigre) carburetors to 6 double (home made ) , immediately 500 rpm more enjoy
  14. leerkracht

    straight 6

    cam shaft info gr
  15. leerkracht

    straight 6

    Radical timing ? the effective timing of the camshaft you need to measure with the clearance from 0.05mm to 0.1mm , you have a lot les timing with these small lobes (make an assembly > inventor and see the result with different clearences )
  16. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    Wonderful work one remark , don't forget to harden the camshaft lobes , otherwise you will get a lot of wear and tear very quickly and all the debris will end up in your crankcase and oil with the known consequences.also use hardened ( Stubbsteel ) and polished cam follewers it takes less...
  17. leerkracht

    making piston ring for Corliss Steam Engine

    I used the method from George Trimble for over years now with 96% perfect rings , good sealing from the first stroke , i lap the bore of my cilinders (from nodulair cast iron GGG40)(meehanite) instead of honing them a new made engine runs from the first of the second flip by hand ( propeller )
  18. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    look at this site lots of information https://steelnavigator.ovako.com/piston-rod-predictor/ https://steelnavigator.ovako.com/heat-treatment-guide/ https://steelnavigator.ovako.com/
  19. leerkracht

    making piston ring for Corliss Steam Engine

    The rings are old style 1/8 3.175mm is to much , smaller rings perform better and wear less (ring and cilinder ) 1mm is better , modern (race) engines all uses small rings you can cut ist at an angle if you wisch
Top